Floor construction.



J.KA11N. FLOOR CONSTRUCTION.

APLICATIONIILBD APR. 8, 1909.

Patenteuune 14,1910.

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FLOOR CONSTRUCTION. APPLICATION FILED APR. M1909.

menten June 14,1910.

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JULIUS KAI-IN, OF DETROIT, MICHIGAN, A-SSIGNOR TO TRUSSED CONCRETE STEEL COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

FLOOR CONSTRUCTION,

ject of this improvement is to provide a floor in which a minimum amount of concrete will be employed.

In the accompanying drawings, Figure l is a vertical cross section of a floor on the line 1 1 of Figs. 2 and 4. y Fig. 2 is a ver tical cross section on .the line 2-2 of Figs. l and 4. Fig. 3 is a vertical cross section of a slightly modified type of lfloor. Fig. 4 is a plan of a floor section, columns being shown in cross section. A

Similar refeience charactersrefer to like parts throughout the several views.

In constructing fire-proof buildings it has been found that the net cost of concrete in the floor is very much greater than that of terra-cotta tile, for the same cross section. It is therefore desirable, wherever possible, to substitute terra-cotta ti'le for concrete and to make the thicknesses for floor slabs as small as possible. It is further desirable to avoid the layer of concrete which usually forms the upper strata of a lfloor slab and which has been thought necessary to supply the compressive strength.

`The' construction hereinafter described has been designed to provide a'floor of terracotta tiles combined with reinforced concrete beams in which the entire lower surface shall be flat and unbroken by beams or girders, and in which a'minimum amount of concrete shall be used. y

In Figs. l and .2 of the drawings, 5 is the lower longitudinal tension member having upwardly inclined arms 6 and between these 'arms is the upper tension 'member 7 also pro vided with Ainclined arms 8. I prefer the type of tension member shown in my former patent dated Feb. 9th, ,4904, No. 751,921, especially in Fig. 10 ,t/liereof. These tension members are embedded in a T-shaped.

beam of concrete formed of a stein 9 and a top cross'piece l0. These beams may be separated by tiles of any desired type,

Specication of Letters.Patentv `Application filed April 8, 1909.

Patented June 14, 1910.

Serial No. 488,574.

whether of terra-cotta, concrete or other plastic material. The number of these tiles in each span will depend upon the load to be carried. In `Figs. 2 and 4, I have shown two large tiles 11 forming the middle portion of the span, and a small tile 12 on each side of the large tiles, the difference in height permitting the top portion of thel concrete beam to extend above the smaller tiles. The thicknesses of concrete and the size of the tiles will of course depend upon 'the load to be carried, and. the top portion of concrete is the main compression member of the reinforced beam. The smaller tiles may be of such width that the concrete in the upper portion of the beam will be of the proper amount to resist the compression stresses. These reinforced members may extend from post 2O to post 20 as do the girdei's 2l in Fig. 4, or they .may extend between the girders 2l as do the beams 22. In all cases, the beams and girders are of the same depth as the tiles 11, and the thickness of their top fianges l0 will depend upon the load and therefoqre on the reinforcing bars.

In Fig. 3 is shown anotherv floor slab made up of reinforced concrete beams and tiles, the large central tile 14 being flanked by smaller tiles 15, and these tiles form the mold for the concrete which \is, as before described, in the form of a vertical stem 'lo and a longitudinal portion '17. at the top ofv the stem. rIhe metal reinforcing bar 18 may be square steel, as shown in theV drawings, or of any other desirable form.

In constructing a floor slab, aflat falsework is employed with straight boards positioned for the bottoms of the concrete beams and girders. As these bottoms are narrow,

the usual expensive watertight false-work is not necessary. After the tiles have been placed, concrete is filled in between the smaller tiles and the reinforcing members construction is less than that shown in my v patent above cited.

` vtransverse cross-section, and the b ocks of.'

Having now explained my improvements, what I claim as my invention and desire to secure by Letters. Patent is 1. A ycomposite floor comprising a body formed of a' lurality of' parallel rows of prepared kbloc s, each block rectan lar in adjacent rows diii'ering in height, the blocks of the outer rowsbeing of less height than .10

the blocks of the interior rows, and reinforced vconcrete beams, T shaped in cross sec- 1 t1on, between adjacent outer rows of blocks.,

the tops of the beams extending-over the lower tiles -flush with the tops'of the higher tiles.

2. A composite floor slab of even thickness throughout comprising groups of parallel rows of terra-cotta tiles, the top of each tile being parallel to its bottom and the tiles of the outer rows being of less height than "those of' the inner rows,l and reinforced conl crete beams*- between adjacent groups of RPP i Witnesses:

other, T shaped 'in cross section, and reinforced concrete girders intersecting the same, and a plurality of rows of `hollow blocks of unequal heights between adjacent beams, the lower surfaces of the ioorbeing flat and vformed by 'the lower faces of all the tiles, girders and beams, thetop of the to form an 'upper fiat surface.

In testimony whereof, I have signed this "cation in the presence of two subscribing witnesses. :y

J ULIUS KAHN.

'SAME SLAGG,

EDWARD N. PAGELSEN.-

beams, girders and higher tiles being flush y 

